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Detection of key transient Cu intermediates in SSZ-13 during NH3-SCR deNO x by modulation excitation IR spectroscopy.
Journal article

Detection of key transient Cu intermediates in SSZ-13 during NH3-SCR deNO x by modulation excitation IR spectroscopy.

  • Greenaway AG UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . Email: andrew.beale@ucl.ac.uk.
  • Marberger A Paul Scherrer Institut , 5232 Villigen , Switzerland.
  • Thetford A UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . Email: andrew.beale@ucl.ac.uk.
  • Lezcano-González I UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . Email: andrew.beale@ucl.ac.uk.
  • Agote-Arán M UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . Email: andrew.beale@ucl.ac.uk.
  • Nachtegaal M Paul Scherrer Institut , 5232 Villigen , Switzerland.
  • Ferri D Paul Scherrer Institut , 5232 Villigen , Switzerland.
  • Kröcher O Paul Scherrer Institut , 5232 Villigen , Switzerland.
  • Catlow CRA UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . Email: andrew.beale@ucl.ac.uk.
  • Beale AM UK Catalysis Hub , Research Complex at Harwell , Rutherford Appleton Laboratory , Didcot OX11 0FA , UK . Email: andrew.beale@ucl.ac.uk.
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  • 2020-03-20
Published in:
  • Chemical science. - 2020
General Chemistry
English The small pore zeolite Cu-SSZ-13 is an efficient material for the standard selective catalytic reduction of nitrogen oxides (NO x ) by ammonia (NH3). In this work, Cu-SSZ-13 has been studied at 250 °C under high conversion using a modulation excitation approach and analysed with phase sensitive detection (PSD). While the complementary X-ray absorption near edge structure (XANES) spectroscopy measurements showed that the experiments were performed under cyclic Cu+/Cu2+ redox, Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) experiments provide spectroscopic evidence for previously postulated intermediates Cu-N([double bond, length as m-dash]O)-NH2 and Cu-NO3 in the NH3-SCR deNO x mechanism and for the role of [Cu2+(OH-)]+. These results therefore help in building towards a more comprehensive understanding of the reaction mechanism which to date has only been postulated in silico.
Language
  • English
Open access status
gold
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Persistent URL
https://folia.unifr.ch/global/documents/83849
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